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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe67152ea311026e3a811d12a6cb5412ec0f5be23b76ea93e902f7cd3721764' 
  AND token = 'qotwu5FZk3iPzgRWK+fLe9ec6OQ5qi2DwVR1yFLjqhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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