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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541b90808e74f9ebc460f768f55ad74e25a4b8e642d9f78b3cddd83a0b4f7f97' 
  AND token = '2Cnu8UHmbeVNYGMfSrLUf10CeCEMGXYthweNVRm9WKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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