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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cff9ae919fa7bb3a61937cee283eaac15ab0cf9f31142453c8a888c5fadeceb' 
  AND token = '2p5KZxUSfuZCSZCumkPaWVjm4Gk6mkwpFZmbZ2YimN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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