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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b969d1f28bbe1a455c11fdb500d50f08280847e40518a8db0f34f038fed1ddb' 
  AND token = 'BnG08m6TPCAdMojb7XoCECxc1iEEFlnMi/ZHY3CaL7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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