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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9401556eaac0d033a2ebd93e14aff92025121f817106048e9dcc673800cdb6' 
  AND token = 'Wsgj9qFemIdrYuuNKv0nfaxFIHRmccqdVO0BiYB8zLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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