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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ace6220bf62781940e33b47db8a73312b9e3a5af2f99a01be00740993519f60' 
  AND token = 'mvoH8HuoWrCxKZoIEobzf6kbdFagYR+3Rg8mKyEPJfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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