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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f5aec49994c02e2eee732a7c867e5f65cacd3bba76904f837242f01c2676cc' 
  AND token = 'hbM8kpoY0M/6G8TYpPBlugTOvNqpOQQrRDE8ZFLEdPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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