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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c6831327bdbb38a4d79f1122a15b03d9cbbdb4b9480f91e2845baed5f4e6d9' 
  AND token = 'AMnmlu6Zr4n0Ivq3iKM5KuHrmEJOA9FFAfWkCpO/x6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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