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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbbe7c214cd376bac1a04d0c4a185ddacb61dc4176496c57cb15a4b01fbb3ae' 
  AND token = 's3mhj6lwlA/zWFDjShWYrEVsuSsg88Vh5Aca3IaY/ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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