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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9ce1fd0de8342f51696b7da4617c3f6a509964feae66e749010747841b6827' 
  AND token = 'Mu2r6Jam32dmVxEv2dzDOWr4Q+jvvXC+Ou2kAqVWX6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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