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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e506e01a1458e08104ea3cda4e8ef13ec066a5f5a4fbcfb93c3347c59648c4' 
  AND token = '1CWOrSu2Yh5O47afiEeC1QdK3z7LiM+aTbTAiG9R5zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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