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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee08471b0667372d41af6eb9d96622bb6d788ef5155a5cea2759c37a36664351' 
  AND token = 'bxvFG89MkM+txdUfDBy1T7PXmz+7QbZgYRoDJiWf6Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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