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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b61b1cd9978ab851ebcc3c3e745839db12bc57da9cc0719aeda9261117d3108' 
  AND token = 'KL10LoblUOLu5S3GRmXu/ekByjVOGqx/8iuioULwDfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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