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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd242067b0c7bebc0760b9c6c64caa672697682b4efe50a3d80fbd5586c4d9e5' 
  AND token = 'w3QRyIBEaiCRuDeh86Y7U4NORtzVZLPtq9JR8IwdBPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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