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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131421409f5ed9e993a41a731e2e8044c8392f0510283b7c8d5d7082b06546df' 
  AND token = 'L5jbYao8GwC/QyDHu0XzeF459CWR8Jn7D8kICBbuXzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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