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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a568433390d5b728127a4e5970b76151e9343eadd130de6fb333fa27d23ad993' 
  AND token = 'T2jJKK6wdJlmMKOyL/9ZORR9AGY0HjGg3Mn3B6ZwlXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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