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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6472be5990c0ebd6c4c0f5cb76137cc5f429e4488087ab790cc94eb749af1f32' 
  AND token = '9pKeNVnUGS2BFoKfBmZMJOLlos8+tOB9WpHhH8jOucc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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