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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121dca3dae20415e1f1c2618643bacc1a535ad1276ec4ec87c5206eb7b7ccc6d' 
  AND token = 'DT/8eXIIkIZ322ySC77qJLXcH8cdQqrbZ39GKyblys4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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