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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5f52f4d613b109e29b3e3035740cdc93b25596a930c92713cbee87f7294d46' 
  AND token = 'tjLKpi3n6ClA4uRriggEEAal0uTTiZ6P9JGtrb9Fi5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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