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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6940418c9e1e72e79d6d0545aea02a935ebd3dd62a97061e19c9f56d0814db22' 
  AND token = 'uG8uLXvBi0h8LFnEYkN/07rEX5NDq0fyXQjKFpi8RpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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