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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430fe6456119e79a85be2c4aea8cec64d6bada7f9e12516fd3685792c1a1ec33' 
  AND token = '2I9BfMCod18dUKgZLSvF8zpuosWGZPZRGaxDyZjVGcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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