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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbcf887c14215d3b65feb85f8c93cf5304f1ca38b59a1738604c5813d267597' 
  AND token = 's9z1elTRvsj7M3uzNYKsgxaXdqAp3J75c2x9zAy9xl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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