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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1df8cbb15488d97da60574bf42d71cd3070b0c86ae7b7393c9cd3deae08e18e' 
  AND token = '2TZq8OCcfcWBndgOu7j6gUIDARpT1ssSyJBHy2GIcN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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