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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee96b1a20b5e177c19d5b7eb310156a550fed6f53e52b100f141d210f32fb3b7' 
  AND token = 'a0J0VECqYV7oz7zBIMeBXzjHIS9RoKpBTApFEvJECcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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