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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac991cdd996c802f838f95d1f91d81142f83b4843a20634c6d1f6767986c6bd' 
  AND token = 'RLATDFbOdsvvJgYWvLCHG233ff8p/g378rgYLSRP6XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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