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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f65ddde7481073b95b6e3e88506df864466903a4e1a4b320c89fd380ab4eb1d' 
  AND token = 'Je6H5nuOFxGrF1F3XvduEmm9VZAZJiHfWJTlKGO66t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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