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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3ab50407fb98fbc2deeb7d1016d37d7d6d6ae6068cbb80d0d3b76666ce1fbe' 
  AND token = 'VYR8d7CDRjWfdaIukwyKHQmKzoYnj+qf9VyQdKH0+CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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