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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7aa7123fc00995c35f8881fc5be90977750b36741d07fe74b1d804e48f7de9' 
  AND token = 'H6RLwTiebAWGv9PP12AFlGJRH6tv5FrfMNAdNBdWItE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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