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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469b53af884640389550f2c2ae16eb62cf3f9d27699ed9a9382542826bb8db07' 
  AND token = '6KUNuM25iknvbStCtfFg30kakAqr9eGhGU+p2/M2eQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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