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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed11a760e8a95dec68421c32c9cb1af11eb35e4f7acc8e716dd3a44f52549d2' 
  AND token = 'GlFAgnsb3xATS9eZ17syD8EqyMwSdfvwVqXd623lByU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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