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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5d7751b315843ca8df76e4eb8b6634bc53de72ee8ab279dd3e1a33885855c0' 
  AND token = 'aIMqLfuTdZrZFiwEmZGYYJk4XEje4T1YNpFOnr0Bo0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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