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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683c3e2fc85867436e6530cb9fe77aaeda55000adf4a7eaf08084fb64ac93eb4' 
  AND token = 'rYsvKr2mYq+Pzdp+dqxomzc9XLKb5WhStHE3mJx+cuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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