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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c134313f45b25d076d32edd5bd8ec0368c89f2e005a5aedb015040f0b1b9cd' 
  AND token = 'wGjAwczim9EbXkj5pBKqy6xUIv+Nd6p/yQRMrFLQJqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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