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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2d4af160a565d11fdb19290236a49a91f37d9da29353dd18c98d2484732aaf' 
  AND token = 'l/nEncUDN6DTtb0p/35gvDL2jJFKPx+Omavl2wz8kyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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