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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc67c01dab09ea215e5b240b205efca14ea5ed97784697494e8bb43033bbc62' 
  AND token = '9C9Oybrg9/IUW9uxvvnEhzm22Dt0XXcSRUkIGf88iZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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