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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00236f7855bd1ed366fc26c47e316d02f02e5b6e323611ef6a73aed6613e1fd' 
  AND token = 'gFY8KgFxyZeiq6rSpcI6/lZGfJ8QhuVxErUhat0PwM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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