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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82045caef69484b31e4ed69f3cc0088d8a195d21ca30ecd477d19e9cc9a28021' 
  AND token = 'tA7dniwhHEGNDMY5mTPKjsHPOrmZW0oxPhqRy/8ZwXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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