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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23481a1c3bc3d922fee1654ef0a9a6160214d1a766c9c5a0d3870f960c9eba6b' 
  AND token = 'f/NvW792DAJltk/Cw2gpVfHHrmPxhfnF7ezsnIHHNq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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