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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b2bb2835a88194b574f6149a65aff7fb261c0c1f50f91cf01c190e5747ebb1' 
  AND token = 'KJmtxDydIyhIF71fYQf5/6LqjNvX72X5tLowsCt5DJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}