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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70af7cdebf58270f75dad4e9fe0fb0cea23eb55c5101d9bcc98c3739deeb3f74' 
  AND token = 'r+qk5gjIB9rwfJEpIErf6oLVll99jKn4IXlY3xyGGoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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