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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81a7f6b66a596470f7a25c5391408ace4b766a9e3ddb815fb6381f01770a86e' 
  AND token = 'b8l7cxeHskz/iALguv2YUXxfres83Pv/nZB9J6/jY5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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