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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46baa8445352e808f2113d94b0759c650c9140ed842c23d2a4dec807c1873ff4' 
  AND token = '9bOtpzrntCGRiwRhnuX7oz9d6sI/VzzA48cce1sc67E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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