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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239e709e40689f463318060671c2ba19c0f929fc961773552b8c0e2b7e2e8fa4' 
  AND token = 'T6zmMB30rirvUF83kxL1d3vI9i1PNnvIxAMZnCO/INQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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