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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd0d5f26aaa067c1cbc9e89f6dd18de67d01e75e6a7ad1e6dec8fbc5043fe49' 
  AND token = '8cmirbID6syao0IqvnSKcLRBJ3ON5Zb6hjCLXExt6m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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