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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33099053177b4290316745756ec24476acd4ff258953b9e54098ab20a7fe0620' 
  AND token = 'GIZkt1CtSAw/4lmTN6Nwn0r9omC8U4n1G6dnd8MuKNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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