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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1fd3b38bacfc2b067f9a84924c9e134faf7e2cbdd3870e3fd1fc296d1cd3ee' 
  AND token = 'CHUqFS/LS7O9aVqXcBoOmG3jVKkBCjeXDdNUbRqMi2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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