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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0103a1105e060b6533c0a90be6565b125389905f1e39d91d5b7dd82eb474ddda' 
  AND token = '/Yd4jj6ck4FtH8YGiS4hnKMVO5zhM2Od1bM5wpk71cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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