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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de9bb1dff00959c5a42460fb33cf5245c8ac95811418ccdb7cc964b9aad636c' 
  AND token = 'hq86QjQPW79MgyUCrhX5vAuqnvyucKrMikaXvEe2c14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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