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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7131f1fb614d79f0b0d1e851904e83420a3a07f7bc49e650ef71b8101191b4b8' 
  AND token = 'uNI2OyQ59jRVhMq5Nr16juR9lc2BWfjQ7H0cbbA6pbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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