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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcd60a7f9a4223c70209bccf391475dfc936ffaaa34eaa062617c300f52d791' 
  AND token = 'VrTK+Zu7BmNnhXn8qbPf3Y62ON3nME2rb3vbmwjVyro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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