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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43f2e7ca254c6d2b9febdec57bb3caaf41e89fe4a45f0311b64309bb6ae1251' 
  AND token = 'RxuDiVqlBbj+5AIGuncC4NtPhSsxO5mRHii/OgFg+TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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