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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ad127b204c0fe20f714e497995579a7e93870e9701943ad8099a4d8cca6914' 
  AND token = 'Y8Inb5QmddyVAwoAa61cguh7lPgZQHFSZ/ZU7h0TmMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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