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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b32fa1c0022dd4f94ee83ae896a9c3bbb79846760a92a90362c79a621b07daf' 
  AND token = 'fmHgaC35wCZKOvX8DSg7Oru4CEw6pAX8jjqAjf+0Jec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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