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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f668e72c9bf4fed6cbd613b4cd65dcd66e49e569222d8969524ba07d6592f893' 
  AND token = 'kPpxvT5Y9Bq3j9IhQLUAD4YQR1ucJaQTRBW98JSO/N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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