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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177c3dbaf3a2f0dae4dc5d61c93ed9ed921724f580e57ea53fe80574bd1883c9' 
  AND token = 'uGmUZIoaIQf5fshdFOIbtHqLqvsXzJzkX4bkeWHWoHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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