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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a20c6c8204b3ec2878c526f163f4bba6859b5df68e91c65e7a323fb6ceaf3b' 
  AND token = 'o3hMlKzqaHDP5l4m30kw1PEyuLxjgUYzK9I0Cg5RW0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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