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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ce08a53c09d0617820a246518682687d48ba868e239c7133e6a0944df8787f' 
  AND token = 'stmxz16VXsftTCC+ARXyLG50FTisW81plUoHt/+HIbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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