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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90b70b955679bd86ce34976aa50c91ef11a6ce3944d44368e6d33c66740a9f3' 
  AND token = 'W5b3qgiz3bHxwVtzsjg7yQvPButlheE0bBpD5v5IKnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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