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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd027c802c9ceb340ea59161a1fbfb9ee4de8dd95e8198a864ddd7b9b62b5660b' 
  AND token = 'vKiHygPslHp4GNXkh//V98c1Qv0hswBoQHa3MXstorM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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