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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea90ae1b9fd6a8d02f05f21733c7a1bb528786b4b8062bb86a11d3e95bd180f' 
  AND token = 'G9v1gX/f2y+nu+DhQcFh+DTAeYve2NpoQBeEfpsOgQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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