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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167122e6f8b3678d15073c1782766ac0f63195fb213ce3d70afa04a2dc469ab8' 
  AND token = 'HkjeagWfGfV59gvcI7bb8sG4VkKXwhnsavzov6yWIuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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