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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad42b3459a2c5221d1032030fadf5f9305965c752daded6f3aa03ba3895a6ee' 
  AND token = '1+1NMM1xwZGGyaMZWc8jofbVgew+Xz14ZZJgEfWWKMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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