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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db9200d17f7e1f7987b2aec9de8cc954b4daf43242b018c1c8115d652b76678' 
  AND token = 'vdWXo41LhIvzAd81P/z3IQ++yYV12BmzVUnAIqSVNWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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