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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bf8b4d1e0eb104e3558784fa59dc43b9fbbc8e3ce60b5188c34f26d76b0fdc' 
  AND token = 'DIfKfxG3AwU0tJ4t47zQfzaoUY6nJVePp1rq6EUuKfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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