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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b63be87bbd7fe828eee54c79f45c7955128e36c0c14af1fb44b85f8cfd6971' 
  AND token = 'FRXMxtNRLSyveUnq3llAEdA7mccb2gy2mNvee8tLGyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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