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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274e3eac7c657f7927487386a5455e583eae4283e6e13fe179e50ed3c53a9b6b' 
  AND token = 'WReEm4wV0jgy3CBTY/zokmxwjGgd+iv9BIUEaZISx7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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