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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c9c133e76c073452739728ef5280e3265cd56a3183018bbe0ed9d8ca1f7bb7' 
  AND token = 'ZhIhv4Pr8N9S+7GWL8oEd3w1iANqprfY5uEVfQucU4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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