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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992938341312cce40457a75244121c6fb409c61db28367f3a911f0014312047d' 
  AND token = 'UAVhEaUn+DodN+BgbOAo5gBG2OpBEbT+V/xUn2iuB6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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